Try Meguiars NXT generation tech wax for the exterior.
It a liquid wax, so it goes on easy. Leaves a "nice" shine that is baby *utt smooth when you get done..
When I use it on my junk, it takes two people to put the cover on, because it wants to keep slipping off one side or the other..
Interior--I've tried many, but have not found an outstanding one yet...